Oval HVAC Duct Liner With Elastic Compression for Uniform Airflow
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Solution Overview
Problem
Current duct liner insulation solutions for oval HVAC ducts are inadequate, leading to inconsistent airstream surfaces and inefficiencies due to dimensional mismatches, and existing universal solutions are either costly or result in exposed fibers.
Innovation Solution
A duct liner insulation product featuring an insulation layer and an elastically deformable layer that compresses uniformly against the duct interior, providing a consistent airstream surface and supporting the insulation to prevent sagging, and can be cut to fit various duct sizes without custom products.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If high density fiber glass blanket liners are used to line oval ducts, then the duct can be lined without custom products, but the airstream surface becomes inconsistent due to bends in the duct liner
Solution Approach 1:
The duct liner is divided into multiple discrete segments or struts rather than a continuous blanket. These segmented components can be individually positioned and secured to the duct interior, allowing each segment to maintain its shape and prevent the bending issues that cause inconsistent airstream surfaces while still providing comprehensive coverage of the oval duct.
Solution Approach 2:
The invention uses a flexible yet shape-retaining liner structure that can conform to the oval duct geometry while maintaining a smooth inner surface. The liner incorporates features such as radial struts and circumferential support elements that provide structural integrity, preventing the material from bending or sagging into the airstream path while still adapting to the duct's curvature.
2Manufacturing precision
If customized kerfed fiberglass blanket liners are installed in oval ducts, then dimensional fit can be improved, but unwanted fibers become dislodged or exposed in the airstream
Solution Approach 1:
The duct liner combines multiple materials with complementary properties: a outer layer or facing that contains and secures the fiberglass insulation, preventing fiber dislodgement, and an inner surface that remains smooth and fiber-free for the airstream. This composite structure maintains the insulating benefits of fiberglass while eliminating the harmful exposed fibers in the airflow path.
Solution Approach 2:
The invention introduces an intermediary layer or facing material between the fiberglass insulation and the airstream. This intermediate layer acts as a barrier that prevents direct contact between the airstream and any potential exposed fibers, while still allowing the insulation to perform its thermal function. The intermediary layer is positioned to face the airstream and keep all fibrous materials contained.
3Ease of operation
If standard duct liner insulation is used in oval ducts, then installation is simple, but the insulation layer becomes non-uniform due to duct curvature
Solution Approach 1:
The duct liner incorporates dynamic or adjustable elements such as flexible struts, expandable sections, or reconfigurable support structures that can be adapted during installation to match the specific oval duct dimensions. This dynamic design allows the liner to maintain uniform insulation thickness across the curved surface while remaining relatively simple to install, as the components can be adjusted on-site rather than requiring precise pre-fabrication.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution ensures a smooth and consistent airstream surface, improving airflow efficiency and preventing fiber exposure, while being cost-effective and adaptable to multiple duct sizes without the need for custom products.
Implementation Method 1
an elastically deformable layer configured to compress the insulation layer against an interior surface of a curvilinear duct (e.g., an oval duct) in a substantially uniform manner
Implementation Method 2
the elastically deformable layer may support the insulation layer within the curvilinear duct such that the insulation layer does not droop or sag downward
Data Source
AI summary
The present disclosure relates generally to duct liner insulation products for curvilinear ducts, and more specifically relates to methods and materials to universally fit duct liner insulation for lining oval ducts in air conditioning, heating, and ventilating (HVAC) systems. A duct liner insulation for a curvilinear duct is provided that includes an insulation layer configured to line an interior surface of a curvilinear duct when installed within the curvilinear duct. The duct liner insulation also includes an elastically deformable layer configured to compress the insulation layer against the interior surface of the curvilinear duct when installed within the curvilinear duct such that the insulation layer extends substantially uniformly around an inner periphery of the curvilinear duct.